Long-Lived Double-Barred Galaxies From Pseudo-Bulges

Details Long-Lived Double-Barred Galaxies From Pseudo-Bulges Long-Lived Double-Barred Galaxies From Pseudo-Bulges

2006-10-17

arxiv.org/abs/astro-ph/0610535v1

Astrophys.J.654:L127-L130,2007

Astronomy and Astrophysics

Astrophysics

Paper submitted to ApJL

Scientific paper

10.1086/511264

A large fraction of barred galaxies host secondary bars that are embedded in their large-scale primary counterparts. These are common also in gas poor early-type barred galaxies. The evolution of such double-barred galaxies is still not well understood, partly because of a lack of realistic $N$-body models with which to study them. Here we report a new mechanism for generating such systems, namely the presence of rotating pseudo-bulges. We demonstate with high mass and force resolution collisionless $N$-body simulations that long-lived secondary bars can form spontaneously without requiring gas, contrary to previous claims. We find that secondary bars rotate faster than primary ones. The rotation is not, however, rigid: the secondary bars pulsate, with their amplitude and pattern speed oscillating as they rotate through the primary bars. This self-consistent study supports previous work based on orbital analysis in the potential of two rigidly rotating bars. The pulsating nature of secondary bars may have important implications for understanding the central region of double-barred galaxies.

Affiliated with

Also associated with

No associations

Rating

Long-Lived Double-Barred Galaxies From Pseudo-Bulges does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Long-Lived Double-Barred Galaxies From Pseudo-Bulges, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Long-Lived Double-Barred Galaxies From Pseudo-Bulges will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-98937